sockstats: add labels for netlog and sockstatlog packages

Signed-off-by: Will Norris <will@tailscale.com>

log/sockstatlog/logger.go

@@ -125,6 +125,7 @@ func NewLogger(logdir string, logf logger.Logf, logID logid.PublicID) (*Logger,
 
 		HTTPC: &http.Client{Transport: logger.tr},
 	}, logf)
+	logger.logger.SetSockstatsLabel(sockstats.LabelSockstatlogLogger)
 
 	return logger, nil
 }